Wilson is a key witness in the five cases, which cannot continue without his testimony.

Wilson, who fatally shot unarmed teen Michael Brown on August 9 and set off weeks of protests and backlash against police, has been in hiding since the shooting. Wilson, who is on paid administrative leave, emerged briefly to testify in Clayton to the grand jury investigating Brown’s death, but he was not seen in public.

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Of the 4,200 felony cases pending in the circuit court of St. Louis County, Wilson was a witness in ten, according to the prosecutor’s office. Of those ten, Wilson was an “indispensable witness” in only five, all of which have since been dismissed.

The five cases where Wilson played a minor role will continue without Wilson as a witness.